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What is This on the Screw?

anotheruser
anotheruser Posts: 3,485 Forumite
Ninth Anniversary 1,000 Posts Name Dropper I've been Money Tipped!
in In my home (includes DIY) MoneySaving
At the top of the teeth part?

IMG_20171122_124859.jpg

Comments

  • societys_child
    societys_child Posts: 7,110 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    edited 22 November 2017 at 2:51PM
    Looks like it's designed to 'tighten' into something, probably with pre-drilled holes.

    Are they some screws you've bought, or screws supplied with self assembly furniture (or something)?

    I note the thread is also different (with small saw-like) pointy bits or 'serrations'?

    Some sort of premium quality, fast thread, self tappers? :)
  • Davesnave
    Davesnave Posts: 34,741 Forumite
    Part of the Furniture 10,000 Posts Name Dropper Photogenic
    They could be these:

    https://www.ffx.co.uk/tools/product/Forgefix-Forffp590Y-5028485145691-5.0-X-90Mm-Pozi-Compatible-Wood-Screw-Box-Of-100
  • anotheruser
    anotheruser Posts: 3,485 Forumite
    Ninth Anniversary 1,000 Posts Name Dropper I've been Money Tipped!
    They were left behind after some workmen put a desk in.
    I missed pozi screws coming in so thought I'd missed another advancement.
  • z1a
    z1a Posts: 2,522 Forumite
    Tenth Anniversary 1,000 Posts Combo Breaker
    "I note the thread is also different (with small saw-like) pointy bits or 'serrations'?"

    I think that's just poor quality rather than intentional.
  • Lorian
    Lorian Posts: 6,663 Forumite
    Twentieth Anniversary 1,000 Posts Name Dropper Photogenic
    They are chipboard screws.
  • EachPenny
    EachPenny Posts: 12,239 Forumite
    10,000 Posts Combo Breaker
    z1a wrote: »
    "I note the thread is also different (with small saw-like) pointy bits or 'serrations'?"

    I think that's just poor quality rather than intentional.

    The serrations, 'spiral' and the 'bars' under the countersunk head (only just visible) are all design features meant to reduce the risk of the screw self-loosening. They all give more 'bite' into the wood and resist rotation.

    Whether or not you need all those features is up to you of course ;)
    "In the future, everyone will be rich for 15 minutes"
This discussion has been closed.
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